Is the option merge selected greyed out when you try to merge layers in Illustrator? This might be why!
I work with Adobe Creative Cloud on a Windows 10 PC, and added most of the used shortcuts for Windows and Mac in the tutorial.
I also use Procreate with an Apple Ipad Pro 2020 256GB.
Free trial Envato Elements: https://1.envato.market/Graphd
Editing: Adobe Premiere Pro
Intro & Outro: Adobe After Effects
Outtro music:
Song: DayFox - Hope
Music provided by Vlog No Copyright Music.
Video Link: • DayFox - Hope (Vlog No Copyright Music)